Belt fastener



H. HAUPT BELT FASTENER .5uEy 259 1924.

Filed March 23, 1922 Patented July 29, 19243 HANS HAUPT, OF BEBLIN-CEIAELGTIENBURG, GERMANY.

T0 all wh0m z'zf mag concem.

Be it known that L HANS HAUPT, 2 citizen 0f Germany, resicling at Berlin-Charlottenburg, Germany, have inventecl cercaln neW and useful Improve1 nents in Belt Fasteners (for Whi0h I have filed an applicti0n in Ge1n'1any 0n March 26, 1921), whicl1 the following is a specificzvtion.

This invention hasreference t0 improi ements in belt fasteners ancl lt is one of f-he objects of my invention t0 provicle means wl1 ereby the fastener is preventecl fro1n becoming unintantionally decached f101n the belt, and t0 generally improve the construct-ion of clevices of this kind.

In belt fasteners with belt engaging teetl1 as heretofore constructed the teeth am us ually cut out from a 1netal plate by a pnncl1- ing die 01 the like in such a manner that the teeth are curved 01 bent upwarcls in the direction of the pull 0f the belt, so that by the strain 0f the pull 'che oucwarcl bencl of t-he teeth is increasecl, while in connecting o1 coupling devices it is of advantage t0 procluce a bending baekwzucls 0f the teeth in which case, however, the teeth Will, of course, ofi"er less resistance and are liable t0 be broken off.

Inasmuch as teet-h which are bent upwarcls in the. direction of tl1e pull of the belt Will have 130 be securecl t0 metal parts which arespacecl f01 at least the full length 0f a tooth joint, so that the outer teeth Will l1ave t0 engage beyond the ends of the belt for a rather considerable distance, there is tl1e difliculty in fasteners 01: this kincl that tl1ese outer teet-l1 which are at a relatively greater distance from the center line of the fastener, become disengaged from the belt in case of a, particularly large cnrvatnre 0f the belt upon the pulley.

My invention is intenclecl to overco1ne this difficu'lty by providing the sheet metal plate from Which the teeth are bent outwards in the direction 0f the pull, with grate-shapecl 01' recessed 'parts, so that the fastener is able to adapt itself to ehe cnrvature of the belt over the pulleys.

By th is means a very increasecl fiexibility and elasticity of the fastener is produced as compared with fasteners having teeth secured to unperf'oraced metal plates. Moreover by my improved construction the addibional advantage is obtaineol that the centrifugal force in view of the reduced weight cf bhe 1netal Will not operate t0 cletach tl1e easily broken 0fi and detached by hanCl,

wl1enever neeclecl.

My mvenclon 1s shown upon tl1e accompanying drawin# wepresenting a, sytrip e1n" 2: boclying 1ny invention b way 0f exunple.

Fignre 1 is a plan view of tl1e grate-like 1netal frmne. In tl1e drawing Figure 2 is a plan view 01 the' fastener as obtained from tl1e strip by the bencling outwards of the teeth, ancl Fignre 3 is a sicle view of the fastener as securecl to tl1e belc encls.

In t-l1e drawing a is the grate-like metal frame which 1nay be'obtainecl by a punchfing process; b am the fastening teeth; 0 and d are tl1e belc en(ls to be united.

The teeth n1ay be proviclecl at clifi"erent portions 0f the skel%ton shaped recesses; they are bent in t-l1e clirection 0f the pull und theyare nniformly subjecte l to the bencling ancl cleflecting Strain in the direction of the pull.

I wisl1 it to be underscood, filmt I do not clesire t0 be limiceclto the exact details of constrnction shown and described, for 0bvious modifications will reaclily 000111 t0 a person skilled in theart.

I claim:

1. In a belt fastener, a sheet metal strip comprising two parallel longitndinally extencling Webs, a plnrality 0f comparatively narrow transversely extending connecting Webs between saicl longitudinal webs tl1e portions intermecliate saicl conriecting webs being cuc ont, und teeth ab both encls of the Cuc-out POBODS, ehe lengtl1 0f euch tooth being less tlmn 0ne half 0f the length 0f the cutout portion.

2. In a belt fastener a sheet metal strip comprising 13W0 parallel longitudinally extencling webs, a plnrality of comparatively narrow transversely exten ling eonnecting webs between saicl longitudinal webs, the nortions incemnediate seid conneccing webs bein cut out, and teeth at b0ch ends of the cut-ous portions, the length 0f eacl1 tooth being lass tlmn 0ne half 0f tl1e Jengtl1 of the cut-ont ortion, the width 01. a cut-out porti0n being greater than the width of a tootl1.

3. A belt fastener comprising tw0 longitudinall; extending substantially parallel strips, transversely extending c01nparatively narrw conneeting webs between ehe longitudinal strips and spaeed from eael1 other, and a pair 0f staggered oppositely disposed outwardly projecting lengthwise extending prongs on eael1 longitudinal strip between the connecting webs.

4. In a belt fastener a flexible slzeleton strip transversely disposed, endwise oppositely shonlderecl parallel bare 0n said strip, and lengtl1wise extending outwardly projecting prongs upo n parallel sides of the shouldered parts, and additional 1OWS 0f longitndinally extending prongs in parallel staggered relation t0 tl1e other prongs and transversely spaced frorn each other.

5. In a belt fastener, a flexible skeleton strip, transversely disposed, endwise oppositely shouldered parallel bars 011 said strip,

lengthwise extending, outwardly projecting oppositely disposed prongs upon parallel sides of said shouldered parts, and additional oppositely disposed longitudinally extending prongs contiguous to said bars in parallel staggered relation to tl1e otl1er prongs and transversely spaced fron1 each other.

6. In a belt fastener, a flexible 1netal skeleton strip, having transversely disposed, endwise oppositely shouldered parallelly spaced bare, lengthwise extending, outwardly projeeting opposicely disposed prongs strucl upfro1n tl1e metal of tl1e strip and upon opposite parallel sides of said Sll0l* dered parts, and additional oppositely disposed longitudinally extending prongs in tegral with the strip and eontiguous 130 said bars in parallel staggered relation to the other prongs and transversely spaced fromm each other.

In testirnony whereof I affix my signature.

HANS HAUPT. 

